The ICO guidance on domestic CCTV does mention that you should have a sign up like Secure says, however I seen no reference to any law that requires it.
As for putting your computer in a locked cupboard, where does it say that it needs to be?
Being inside the house which has locked doors is ample enough to cover "secure" storage.
My neighbour has a camera on the front of his house that points to where he would park his car on the street.
No one really cares about it, he does not tell anyone he is sending the data to the police or capturing audio, it's just sitting there.
We have cameras all around us when walking through a town centre etc, I never see any signs on them.
If your not recording but only watching a camera and it's capturing some public areas then it is no different to your being there and watching them or filming them with a hand camera.
There is no expectation or privacy when in public, you can film and take photos of almost everything when in public.
You have made serval assumptions that are not correct and your example of "no different than being there watching" is also not correct. It's been argued many times in various arenas.
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